Motorola and V.32bis, V.34-SDC manual 326X Series Modem Diagnostic Tests, Test Description Command

Troubleshooting

326X Series Modem Diagnostic Tests

The modem supports loopback, busy out, and retrain tests to assist you in isolating network problems. These tests analyze the telephone line and the local and remote modem’s performance. These tests can be initiated from the modem’s front panel, using AT commands from an attached PC or terminal, or from a network management system.

The following table shows the AT commands to initiate and terminate tests. The steps following the table describe how to initiate and terminate each test from the front panel. (Refer to your network management system documentation for instructions on initiating and terminating tests from the network management system.)

IMPORTANT: The tests described in this section cannot be run simultaneously. Because each test interrupts data flow in a network, notify equipment users at both the local and remote sites before starting tests.

For details on tests, refer to Chapter 4 of the 326X Series Modem Reference Guide.

		AT
Test	Description	Command
Local Analog	Tests the local modem’s transmit and receive circuits	&T1
Loopback	by looping local DTE data from the modem’s
	transmitter to its receiver.
Local Analog	Tests the local modem’s transmit and receive circuits	&T8
Loopback Pattern	with an internally generated test pattern.
Remote Digital	Using local DTE data, this test examines the transmit	&T6
Loopback	and receive circuits of the local and remote modems
	and the telephone line.
Remote Digital	Tests the transmit and receive circuits of the local and	&T7
Loopback Pattern	remote modems and the telephone line.
Data Mode Pattern	The modem uses internally generated test patterns to	Not
	provide data and separately test the inbound and	applicable
	outbound halves of the transmission path.
Local Digital	Using the remote DTE data for the test, the telephone	&T3
Loopback	lines and the remote modem circuits are tested.
Busy Out	Allows the modem to appear busy to incoming calls.	H1
Retrain	Lets you manually retrain local and remote modems.	O1
(Terminate)	Terminates any test in progress.	&T0

6-10 Troubleshooting Guide